Explosive crossbow
Pause the game and quickly press Left, Right(2), Left, X, Y, R, L, X, Y, Left, Right. If you entered the code correctly, the screen will flash white and a whooshing sound will play.

Missile crossbow
Pause the game and quickly press Right(2), Left(2), R(2), L(2), Y(2), X(2). If you entered the code correctly, the screen will flash white and a whooshing sound will play.

No bullet damage
Pause the game and quickly press Left, Right(2), Left, X, Y(2), X. If you entered the code correctly, the screen will flash white and a whooshing sound will play.

Explosive sniper
Pause the game and quickly press R, L, Right(2), Left(2), Right(2), L, R, X, Y. If you entered the code correctly, the screen will flash white and a whooshing sound will play.

Infinite Spy Cam
Pause the game and quickly press Left(2), Right(2), L(2), R(2), X(2), Y(2). If you entered the code correctly, the screen will flash white and a whooshing sound will play.
Infinite health
Pause the game and quickly press Left, Right(2), Left(2), Right(2), Left(2), Right(2), Left, X(2). If you entered the code correctly, the screen will flash white and a whooshing sound will play.

One-hit kills
Pause the game and quickly press Y, Left, Right(2), Left, Y, R, L, Y, X(2). If you entered the code correctly, the screen will flash white and a whooshing sound will play.

Infinite TOC
Pause the game and quickly press Y(2), X(2), Left, Right(2), Left, R, L, R. If you entered the code correctly, the screen will flash white and a whooshing sound will play.

Opening The Door In The Basement When Chasing Van Cleef
When in the basement, you will find a health pack and below it a wooden plank. Use your night vision goggles to see a green line that connects to a door further up. Around that bend is a patrolling guard. Kill the guard and pick him up. Walk over to the plank and place the body there. The door that the green line you saw earlier connects to is now open.

Half Damage
Press Start to pause game play, then press X(2), Y(2), Left(2), Right(2), Y(2), X(2). The screen will flash white and a whooshing sound will play to confirm correct code entry.